What ocean is on the West Coast of the United States?

The Pacific Ocean is the correct answer because it is the large body of water that borders the West Coast of the United States. This ocean stretches along the coastline from the border of California in the south up to the state of Alaska in the north. The Pacific Ocean is the largest and deepest ocean on Earth, significantly influencing the climate, ecology, and economy of the Western U.S., including important ports such as Los Angeles, San Francisco, and Seattle.

In contrast, the Atlantic Ocean is located on the East Coast of the United States, while the Indian Ocean and Arctic Ocean are far removed geographically, with the Indian Ocean located to the south of Asia and the Arctic Ocean situated to the north of the main continents. Thus, when considering which ocean is adjacent to the West Coast, the Pacific Ocean is the only correct selection.